Dudley Do-Right- The gracious mountie's naivety comes from his Canadian nationality stupidity. Riding around on Horse (his horse's name) in his goofy hat, Dudley never can quite grasp what's going on. Usually, he resolves whatever conflict is at hand through an act of sheer serendipity. Humor is the intended goal with his character.

Forrest Gump- The slow thinking, fast moving Southerner is one of the most popular examples of a naive hero in modern times. There are plenty of great scenes exhibiting humor through his naivety. In one, Forrest, unable to comprehend the significance of talking to a US President, responds to JFK's query "How do you feel?" with the classic line, "I gotta pheea..."

Tommy Pickles- The childhood innocence and lack of understanding it implies is present in the year old Rugrat and used mostly for humor value. Despite the fact that little Tommy doesn't understand the truth of many conflicts in his episodic adventures, his toddler bumblings end up in triumph anyway. For example, when the electricity goes out, he believes opening the refrigerator will restore the power. Hence, he goes on a quest to open the menacing white door in his darkened home. Ironically, his father, Stu Pickles, fixes the circuit breaker the exact moment he opens the fridge.

As an interesting side note, I realized as I wrote this that many naive heroes are perceived as likable. Through their goofy flaws and ignorance, they present such a backwards narration that people end up sympathizing for them, and ultimately liking them.